What are magic the gathering cards worth?

i have 2 unopened decks of magic the gathering cards both packs have 30 cards 1st deck box reads "white planeswalkers,,,,,guided by duty and law. white planeswalkes lay down the and command armies to enforce them." 2nd deck box reads "green planeswalkers,,,,,,,ferocity defines green planeswalkers... show more i have 2 unopened decks of magic the gathering cards both packs have 30 cards 1st deck box reads "white planeswalkers,,,,,guided by duty and law. white planeswalkes lay down the and command armies to enforce them." 2nd deck box reads "green planeswalkers,,,,,,,ferocity defines green planeswalkers who overwhelm their enemies with giant creatures." i know nothing about theses cards or the game, should i try to sell them or just toss them?
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